Nuclear fission is a physical process in which heavy atoms such as uranium are split into pairs of smaller atoms. This process is used in atomic bombs and nuclear power plants. But for many years, scientists thought that splitting large atoms like uranium, whose atomic mass is 235 or 238, into two parts is impossible in terms of energy.
In
December 1938, a German made it possible. His name is Otto Hahn. In 1932, when
James Chadwick discovered the atomic particle called the neutron,
a new means of breaking the nucleus of the atom was created. Together with his
friend Fritz Strassman at the Kaiser Wilhelm Institute in Berlin, Otto Han
fired low-energy neutrons
at uranium atoms
and discovered that the element called barium was formed in this process.
According
to Otto Han, all this happened due to the explosion of the nucleus of the atom,
but he was not sure what the physical basis of these results was. A woman named
Lise Meitner in Sweden wrote a letter to the physicist about her experiment and
the results obtained from it. Meitner and his brother Otto Frisch proposed this
theory and then proved that the nucleus of uranium had split and published
their results in the journal "Nature".
Meitner
calculated that in every process of the nucleus of an atom breaking down, about 200
mega electron volts (Mega Electron Volt) of energy is released. This process,
similar to the splitting process of biological organisms, was named fission.
Otto Hahn was awarded the Nobel Prize in Chemistry in 1944 for this discovery.
Otto Hahn and Meitner discovered several radioactive isotopes of the elements
radium, thorium, protactinium, and uranium.
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